linux-kernel - Re: [PATCH] usb: cdnsp: Fixes issue with dequeuing not queued requests

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Date:   Fri, 14 Jul 2023 10:14:36 +0800
From:   Peter Chen <peter.chen@...nel.org>
To:     Pawel Laszczak <pawell@...ence.com>
Cc:     gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] usb: cdnsp: Fixes issue with dequeuing not queued
 requests

On 23-07-13 04:14:29, Pawel Laszczak wrote:
> Gadget ACM while unloading module try to dequeue not queued usb
> request which causes the kernel to crash.
> Patch adds extra condition to check whether usb request is processed
> by CDNSP driver.
> 

Why ACM does that?

> cc: <stable@...r.kernel.org>
> Fixes: 3d82904559f4 ("usb: cdnsp: cdns3 Add main part of Cadence USBSSP DRD Driver")
> Signed-off-by: Pawel Laszczak <pawell@...ence.com>
> ---
>  drivers/usb/cdns3/cdnsp-gadget.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/usb/cdns3/cdnsp-gadget.c b/drivers/usb/cdns3/cdnsp-gadget.c
> index fff9ec9c391f..3a30c2af0c00 100644
> --- a/drivers/usb/cdns3/cdnsp-gadget.c
> +++ b/drivers/usb/cdns3/cdnsp-gadget.c
> @@ -1125,6 +1125,9 @@ static int cdnsp_gadget_ep_dequeue(struct usb_ep *ep,
>  	unsigned long flags;
>  	int ret;
> 
> +	if (request->status != -EINPROGRESS)
> +		return 0;
> +

Why not you use pending list which used at cdnsp_ep_enqueue to do this?


>  	if (!pep->endpoint.desc) {
>  		dev_err(pdev->dev,
>  			"%s: can't dequeue to disabled endpoint\n",
> -- 
> 2.37.2
> 

-- 

Thanks,
Peter Chen